Separator for warp stop motions



Sept 4', 1928. I 1,683,215

w. H. WAKEFIELD SEPARATOR FOR WARP STOP MOTIONS Filed May 27, 192'? P p P 41 l i 15' 4 12 4a 10 11 1.5 A?

W s2 52f 14 1, bra/Mar i 2 My 17' Mmm/ Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE.

WALTER H. WAKEFIELD, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SEPARATOR FOR WARP STOP MOTIONS.

Application filed May 27, 1927. Serial NO. 194,804.

This invention relates to separator devices for the separator bars and oscillating de tector rods of warp stop motions and it is the principal object of the invention to provide means for using a plurality of different forms of warp guiding separator bars to the end that the warp line so far as the warp stop motion is concerned may be raised or lowered with respect to the detector rods.

In warp stop motions of the kind set forth in patent to Regan No. 1,265,112 there is a non-circular oscillating detector rod which passes through slots formed in the upper ends of the drop wires. The tops of the slots are restricted to arrest oscilla tion of the detector rods when any drop wire is in lowered position. The separator bars constitute guideways for the lower ends of the drop wires and furnish relatively fixed surfaces against which the lower ends of the drop wire may be held during the stopping of the oscillation of the detector rod. The warp threads pass between the separator bars and the detector rods and under certain conditions it is desirable to change the distance between the tops of the separator bars which determine the shed line and the detector rod. p i

In weaving such fabrics as georgette the harnesses are moved two up and two down and this results in a uniform motion on the part of the drop wires, all of the drop wires undergoing substantially the same vertical motion during each pick of the loom. It the same loom is to be used for weaving satin the harnesses will be given a motion of one up and tour or more down and this change in the shedding produces an uneven movement on the part of the drop wires.

Certain fabrics are built according to a pattern which permits such a drawing-in of the warps as will allow the drop wires nearest the harness frames to be in substantially the same relative position with respect to the detector rods as are the drop wires most remote from the harness frames or those nearest the warp beam. Certain other fabri'cs require the warp threads to be drawn in through the harnesses in such a way that the drop wires nearest the harness frames will be in a relatively high positionwith respect to the detector rods whereas the rearmost drop wires will be in low position. There is .a certain minimum distance between the narrow part of the drop wire slot and the detector rod which cannot be reduced without causing undesirable stopping of the loom due to occasional uneven letting-oil of the warp.

In any of the cases mentioned it is desirable to have the drop wires so placed that the narrow partof the slots will be as near the detector rods as possible. The reason for this is that if a warp thread should break several inches forwardly of the warp stop motion and become entangled with neighboring warps several picks might elapse before the drop wire would fall into stopping relation with respect to the detector rods. It is because of this possibility of entanglement between the broken warp threads and neighboring warp ends that the distance between the top of the drop wire slot and the detector rod should be as small as possible.

In order to be able to maintain the tops of the drop wires in proper position with respect to the detector rods in all of the various conditions heretofore described it has been proposed to provide vertical adj ustment for the separator bars relatively to the detector rods so that under certain conditions the dro wires can be in lowest position such as w ien weaving georgette while in other conditions the drop wires will be in a relatively higher position such as when weaving satin. Mechanism for accomplishing this adjustment is described and set forth in co-pending application filed by Shutt, Ser. No. 194,178, the adjustment therein being accomplished by the use of movable brackets or supports for the separator bars.

The same result may be attained by using separator bars ofdifl'erent heights, the supports or brackets for the separator bars being always in the same position. 'With different bars it is necessary to provide a corresponding adjustment for the separators which hold the'separator bars and detector rods in proper spaced relation on relatively wide looms.

Separators of the kind set forth in the patent to Regan No. 1,496,377 have gone into general use, and constitute a central body portion to which is hingeda bottom cap serving to clamp the separator to the outside bars. It is these outside bars which I propose to uso invaryin-g heights and I accorclingly provide a separator which is clamped to the intermediate bars of constant heightand leave a space forthe outside bars 1 whichdetermine the warp line so far as the warp stop motion is concerned. In this way the separator clainp can be held in fixed re- ,lation with respect to the low bars andthe outside bars can be of difi'erent heights with out requiring changes inthe'separator.

\Vith these and other obj ectsin view which will appear as the description proceeds my invention"rsidesin thefcoi'nhifnation and arrangenierit' ofparts hereinafter described andse'tferth inlthe'claiiiis.

In the accompanying drawings wherein a corivenieht embodiment" of my invention is set forth,

1 is verticaltransverse section through a war'p stop motion showing my improved forni of separatoi'" with relatively low outsidehars on which'the warp'threads t Fig. 2 is a rearelev'ation taken in the dire'cti'onof arrow 2, Fig; 1,

Fig. 3 is a fragmentary top plan view taken in thedirec'tionof arrow 3, Fig. 1,

F d is a vertical detailed section taken on line 4+4 of 'Fig. 3, and,

Fig. 5'i's aview siniilarto'Fig. 1 but with reletive'ly higher outside separator bars.

Referring to the drawings the separator comprises a bodyp'ortion in the upper end of whichflmay be foi-niecl a plurality of upwardly opening relatively v short slots 11 which serve to position" the" oscillating non-- cilfeular detector rods 12; A forked projection 13 extends to the right from the upper'p'art ofthsport-ion 10as viewed in FigXIanidQre'ceiVes a securing'bolt 14 the upper end of whichf is provided with a? winged nut15 which bears on'tl'ie' t'opoi the fork'e'd projection bottoin cap 16 is pivoted to" the body portion lOa's at 17 and hasthe right hand end thereoffol'inediwith the" op'en slot 18 which receives thelowei"hooked end 1901 the bolt. 1 1. The inatterthusfar descrihed Inayheof common construction and forms.

no part of my present invention and for a furtherdescription of the purpose and function of the separator reference may hehad to the aforesaid Regan Patent No. 1,496,377.

My" invention" relates more particularly to therneans for using separator barsof varyihg heights and in carrying my invention into effect I provid'ei the" lower part of the body portion 10" with relatively short slots which receive separator bars 31. Said barswhen'the parts are inthe position shown in Figs. 1 and 5constitute' the" support for the separator, the hingeca p 16' and the body portion 10 adjacent the upper ends of the slots 30 he ng clainped against said bars and held'in positionhy'thewinged nut and bolt;

The outside bars are housed in slots 32 whichare relatively longer and extend above the slots 30. If desired a central slot of the-same height as theslots-32 may also be provided as clearly shown in Eigsxl and 2. The outside bars as shown at 34in Fig. 1 are somewhat higher than the bars 31 but do not reacht'o*the'toppf the slot 32 and therefore serve no function as supporting the separatorl' lVhen' changing conditions of the loom require the drop wire D to bein a relatively higher position with respect to the warp T larger'hars nay placed in the slots was shown in Fig. 5 the effect of which will be held higherwith respect to the oscillating detector rods 12. Said drop wires are provided with slotsA'Oth'e upper ends of'which' are restricted as at' ll so as to arrest oscillation of'th'e detector rods whena warp flirendbre ks' and' thus stop the loom. l I here desiredthe central bar 36 ma he of the same'hei 'ht' the outside Bars cor spending either to the r'elatively lew' bars'34 of the relatively high hars 351 H As previously stated ditferingiconditions in the same loorn render it desirable to change the relation betweenthe narrow parts 4:1 of the drop wire slots and the detector rods 12. The drop wires are positioned vertically by the warps and thereforeindirectly' by the outside b; 's' and hv' changing the latter from one height t'o 'andthef 'the' desired the driving of the warp stop motion may be set forth in- Patent' t'ol'lohnes No. 1,360,639 and that the separator bars at the ends'of the stop motion held by the brackets shown in Regain Patent N 0. 1,375,729; The Holmes patent and the last n'ained Regan patent form no part ofiny present invention and the parts shown therein are not illus-' tratedjhelein. Although I have described the invention as'rna'king provision f0r'vary-- ing the outsidebar's in or'derfto" determine the warp line yet I" do notwish to "be'liini'ted to this arrangement as it is apparen't'tha't' other bars could determine the warp line" especially in stop motions employingmore banks of drop wires but it is sufficient for the purposes of this in'vention if certain of the bars remain constant for all conditi'on's' of weaving and that t'hese bars he those whichsupport theseparator. v v 7 Having thus described my invention it will be apparent that changes" and in'odifieag tions may he made therein by those skilled intermediate separator bars which lie belowthe outerbars and oscillating detectors of a. warp stop motion, said separator having a body portion with provision tor clamping 1 the same to certain of the intermediate separator bars and having provision for loosely guiding the outer separator bars which extend above the bars to which the separator is clamped.

2. A separator for high outer and low intermediate separator bars which lie below the outer bars and oscillating detectors ot a warp stop motion, said separator having openings to receive certain of the separating bars to which said separator is secured, and said separator further being provided with guidways extending above the openings for the bars to which said separator is cla1nped,'said guideways to receive loosely the outer bars which extend above the bars to which the separator is clamped.

3. A separator for the separator bars and oscillating detectors of a warp stop motion, said separator comprising a body portion having slots therein of diii'erent heights and a hinged cap by which the body portion is clamped to the bars located in the lower openings, the other openings extending above the lower openings to receive separator bars which extend above the bars to which the separator is held.

4. In a warp stop motion, having relatively low intermediate and relatively high outer separator bars, a separator supported by the intermediate bars only, said separator having an opening therein extending above the lower bars, a relatively high separator bar located in said opening extending above the lower bars and being loosely guided by said last named openings.

5. In a warp stop motion, a plurality of relatively low separator bars, a separator having relatively short slots to receive the low separator bars and having longer slots extending above the shorter slots, and separator bars loosely guided in the longer slots and extending above the lower separator bars.

6. In a warp stop motion, a plurality of relatively low separator bars, a separator having relatively short slots to receive the low separator bars and having longer slots extending above the shorter slots, and separator bars loosely guided in the longer slots and extending above the lower separa tor bars. and means engaging the underside of the lower bars to hold said separator in fixed position with respect to said lower separator bars.

7. In a warp stop motion, a plurality of relatively low separator bars a separator having a body portion with dmvnwardly extending open short slots to receive the relatively low separator bars, a cap pivoted to the body portion and engaging the undersides ol. the low separator bar, and other separator bars extending loosely through and guided by longer slots formed in the body portion, the upper parts of said other bars being spaced from the tops of the slots containing the same and being above the tops of the lower separator bars.

8. In a warp stop motion, a plurality of separator bars certain of which are relatively low and others of which are relatively high and extend above the relatively low bars, an oscillating detector rod, a separator for the bars and rod, means to clamp the separator in fixed position on the low bars, said separator being provided for guideways extending above the low bars to receive the relatively high bars, and said separator having a supporting portion for the detector rod, the said supporting portion being always the same distance from the low separator bars, and the guideways in the separator being capable of receiving any one of a plurality of relatively high separator bars any of which extend above the low bars.

In testimony whereof I have hereunto affixed my signature.

IVALTER H. IVAKEFIELD. 

